Designed to replace the bulky fleece layer that takes up too much space in your backpack, the MontBell U.L. (Ultralight) Down Jacket weights no more than a T-shirt and packs up around the size of a water bottle.

In addition to keeping you warm, the Montbell U.L. (ultralight) jacket’s 15-denier ballistic Airlight nylon shell is wind and water resistant. This ultralight down jacket is great for under a rainshell or gore-tex shell and over a mid-weight baselayer.

800-fill goose down lofts easily allowing more body heat to be trapped between the feathers which keeps you warm